1. Report of evaluating committee V, periodontal workshop;J.A.D.A.,1952
2. Roentgenographic studies of tissues involved in chronic mouth infections;Black;D. Summary,1918
3. Teeth of the Masai;Schwartz;J.D. Res,1946
4. Dental defects and periodontal disease in Egypt, 1946–1947;Dawson;J.D. Res,1948
5. Roentgenographic survey of periodontal disease in India;Marshall-Day;J.A.D.A.,1949